class_docstr: AvgPool or MaxPool with BN. `pool_type` must be `max` or `avg`.
code: def forward(self, x):
      out = self.pool(x)
      out = self.bn(out)
      return out
  
imports: import torch
  import torch.nn
label_desc: Use image node_id 2 for calling the PoolBN obj's underlying member method code with example usage: obj.forward(x) and returns: out